Just check why you can't access your F drive. As you did not post any system info it is not clear what type of drive it is. Open Windows Explorer and see if you can create folders on your F drive manually. If so then run BM again and see what happens.

With removable drives it is best to manually assign drive letters to them, otherwise Windows may assign different letter each time you plug it on, depending on what other drives/USB sticks you have connected at the moment.